quota: Don't store flags for v2 quota format

Currently, v2 quota format blindly stored flags from in-memory dqinfo on
disk, although there are no flags supported. Since it is stupid to store
flags which have no effect, just store 0 unconditionally and don't
bother loading it from disk.

Note that userspace could have stored some flags there via Q_SETINFO
quotactl and then later read them (although flags have no effect) but
I'm pretty sure noone does that (most definitely quota-tools don't and
quota interface doesn't have too much other users).

Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/quota/quota_v2.c b/fs/quota/quota_v2.c
index 02751ec..54cac43 100644 (file)
--- a/fs/quota/quota_v2.c
+++ b/fs/quota/quota_v2.c
@@ -126,7 +126,8 @@ static int v2_read_file_info(struct super_block *sb, int type)
        }
        info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
        info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
-       info->dqi_flags = le32_to_cpu(dinfo.dqi_flags);
+       /* No flags currently supported */
+       info->dqi_flags = 0;
        qinfo->dqi_sb = sb;
        qinfo->dqi_type = type;
        qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
@@ -157,7 +158,8 @@ static int v2_write_file_info(struct super_block *sb, int type)
        info->dqi_flags &= ~DQF_INFO_DIRTY;
        dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
        dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
-       dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
+       /* No flags currently supported */
+       dinfo.dqi_flags = cpu_to_le32(0);
        spin_unlock(&dq_data_lock);
        dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks);
        dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk);